Service manual

Changes in UCR Ratio with Image Density and Copy Mode
- Letter Areas -
The UCR ratio in letter areas is always 100%.
- Photo Areas, with ACS Priority set to Bk -
In photo areas, when the user sets the ACS priority to Bk, UCR begins to
replace color toner with Bk toner at low image densities (when MIN is about
13). This is to prevent the UCR process from reducing the image density too
much in low image density areas.
At this point, the UCR ratio is zero. As shown in the graph above right, it
gradually rises with image density, and the UCR ratio is about 100% when
MIN is 255.
- Photo Areas, with ACS Priority set to Full Color -
When the user sets the ACS priority to Full Color, the UCR process does not
begin to replace color toner with Bk toner until a low-medium image density
(when MIN is about 102).
At this point, the UCR ratio is zero. It gradually rises with image density, and
the UCR ratio is about 95% when MIN is 255.
UCA (Under Color Addition)
Using only UCR processing, the copy lacks depth. So, a specified ratio of
toner is always added for each color (YMC only). The amount of additional
toner is proportional to the density of that color on the copy. It is only done in
letter areas.
The UCA level can be adjusted with SP 5-602-2.
MIN: Similar to
the Common
ID Value
IMAGE PROCESSING
A166/A187/A189 2-56 SM
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA